Improvement in processes of producing paper printing-surfaces



'C. G. MAURICE Process of Prdducing' Paper Printing Surfaces.

No. 196,466. j Patented Oct. 23,1877.

UNITEnS'rA'rEs PATENT OFFIICE.

CHARLES o. MAURICE, or NEW YORK, N. r.

IMPROVEMENT IN PROCESSES 0P PRODUCING PAPER PRINTING-SURFACES.

Specification forming part of Letters Patent No. 196,466, dated October 21,1877; application filed March as, 1877.

- lowing specification.

This invention consists in the process of preparing paper, tissue, or parclnnent, for;

printing directlyfrom, after the manner of lithography, by treating the same to the severalsteps mentioned, in the order of their succession, and with the various ingredients hereinafter specifically set forth.

In the accompanying drawing I have illustrated an apparatus .which isadapte'd to be used in carrying outmy said invention, in which Figure 1 represents a plan or 'top- View of the apparatus; Fig.2 is averfical cross-seciion thereof. 1

Similar letters indicate corresponding parts.

The letters A B designate two rollers, having their bearings in a frame composed of two standards, 0 0, and one of which rollers is provided with a sleeve or covering, D, of indiarubber or its equivalent material. With the rollers A B is combined a bed composed of two plates, E F,-placed uponeach other, and which are placed between the rollers A B at one end, the lower one of said plates being preferably made of zinc and the upper one of tin. Onthe shaft of one of the rollers A B is mounted a crank, G, for imparting a revolving motion to the rollers.

T In carrying. out my invention, I place a blank sheet of paper on the lower or zinc plate E, having previously removed the upper plate F, and lay upon it a pattern-sheet containing the drawing or writing or other work to be reproduced, this work being made with lithographic ink, crayon, or any other lithographic material. This pattern-sheet is placed with its face downward, in contact with said blank sheet, and on top of it is placed a damp sheet of paper of suflicient size to cover the entire rear surface thereof. The whole is then covered by the plate F, and a revolving motion is given to the rollers A B, successively,.in. opposite directions, so asto draw the-bed-plates E F forward and backward, say ten times, so that the work is subjected to pressure between the roll 'ers A B. I then lift up the top plate F, and

remove the damp sheet of paper, and put'another damp sheet of paper in its place-that is to say, on the original or pattern sheet. The top plate F is then replaced and the whole a second time subjected to pressure between the rollers A B, in the manner stated. The second damp sheet is removed, and, after damping thoroughly with a sponge, water is allowed to remain on the original orwpattern sheet a sufiicient length of time to thoroughly soak the latter, and, by this means, together with the pressure referred to, the work is transferred to the blank sheet of paper, and the latter assumes the form of what I term a printing-sheet, or a sheet to take impressions from.

The primary. object of transferring the work from the original to a printing sheet, as specified, instead of using the said original as a printing-sheet,.is to place the work in the proper reverse position, which is necessary, especially when the work consists of writing or type'lettcr. However, when the copy to strike off from the prin g-sheet is done upon tissue, tracing, or translucent pap er, the transfer is not necessary, as the said original can be used as a printi1-1g-sheet,the work tobe duplicated being done upon the said blanksheet of paper. 7

Previous to using the-sheet of paper as a printing-sheet, however, it must be preparedin the following manner: If the printing-sheet is composed of sized paper containing either I rosin, or sulphate of calcium, or sulphate of baryta, or analogous substances, I submit it,-

before printing therefrom and after the work has beendone directly on it or transferred thereto, to the following treatment: I immerse taining thirteen per'cent. nitric acid and two per cent. gum-arabic, and repeat the operation said sized paperin water containing two per of washing it and inhing'the work, Ithen innmri-sethc paper in water containing fifteen per cont.gum-mimic, and let- -it dry. i I then wash inn. third time with pure water, and lay it: on the zine-plate .l' the surface of which is 7 previously covered with printin-g ink by means of 2m inking-roller, or in any other desirable wa y,:s0'thatthe back of the sheet becomes cemented to thessid plate E. 7 face of the sheet, where the work 'is,is then The upper snr rolled up in the some way as practiced by lithographic printers in rolling-tower: lithoi 7 graphic stones-411st is to say, by dampening" the paper with clean water.

But when a certain. number of copies is wanted, instead of using pure water, i use water containing twentyth'c percent. or fifty per cent. of glyo.

crime, and T m we r the printing-sheet with that 7 solution one hourbcfore printing, and by means construction.

It the 'prinhng-slwci is composed of nnsized of a printing-or copying: press of any suitable paper, 1 pro mm itbcfin-cdoing dimctly upon or t 'a'msferring the work thereto, as follows '1 immerse the said unsized sheet of paper in concentrated sulphuricacid conta-iningtwenty per cent. of pure water, it snflicient length of time for tlw disintegration of the cellulose of the pzmcr-nlmntonominnte. Tthcn immerse the sheetin water satliruted'with chloride of calcium, and then in water containing eight per cent. mnmoniue, and then immerse it inpure wan-r. it is then successively immersed in water continuing: six pc cent. or eight per 7 cent. gum-arable, and aftcrwzudin water con 'tiiining fifteen per cent. nitric acid.

it is then again immersed in pure water. I then allow the sheet to dry, and when it commences to curl I subject it to pressure inany convenient way. The sheet is then ready to receive any prepared according to said formula;

I can also use any other pepenor tissue :whichis insoluble in watenibnt will slightly absorb the same, and which is adapted to strongly absorb lithographic ink. I can also use any paper which is covered; on: one of its surfaces m'th metal.

\Vhat I' claim as new, and desire to secure by Letters Patent, is

The process of preparing e sheet of paper, tissue, or parchment for printin gr directly from,

after the manner of lithography, by treating the some to the several steps mentional, in theorder of their succession, and with the various ingredients hereinbetbre specifically named,

- (l. O. MAURICE, \[L s] lVitncsses:

W. HAUFF, F.'KASTENHUBER substontizilly as and for the purpose described. r

In testimony that I: claim the foregoing I have hereunto set my hand and seal this 23d .day of March, 1877 

